Li’s team has also designed a refrigerator-sized fuel cell that uses a liquefied version of the stored power. That could produce electricity for homes, he said, and “nothing goes into the atmosphere.”
If the powder does not release anything into the environment then this could actually be carbon negative?
I'm assuming they're referring to a closed carbon loop instead of the current open one. If we reduce greenhouse gasses to a reasonable level then extract as much CO2 as we input, there's really no issue.
That is super cool, and is certainly exciting news for the fight against climate change. I just learned the other day that Venus suffered a massive climate change with the build up of CO2 that is the reason why it is how it is today; and I’d hate to think of the earth suffering a similar fate.